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Surface Soil Textural and Potential Erodibility Characteristics of Some Southern Sierra Nevada Forest Sites¹

ABSTRACT

Analyses of texture and potential erodibility were made on 208 samples of residual, upland forest soils collected at elevations from 6,500 to 8,000 feet in the southern Sierra Nevada in California. Multiple regression tests showed that soil texture and erodibility indexes were significantly related to variation in parent rock type, vegetative cover type, aspect, slope, and elevation. Prediction equations implied that granitic forest soils at high elevations may be twice as erodible as soils developed under similar soil forming conditions at low elevations.

¹ The study was conducted as part of the cooperative research program between the Pacific Southwest Forest and Range Experiment Station and the California Department of Water Resources.

² Research Forester, Pacific Southwest Forest and Range Experiment Station, Forest Service, U. S. Department of Agriculture, Berkeley, Calif.

Received for publication July 13, 1964. Accepted for publication November 24, 1964.